FIG. 2.

Growth of transfectant viruses in Vero (A) and MDCK (B) cells. Confluent monolayers of Vero or MDCK cells were infected with viruses at an MOI of 0.05 and incubated at 37°C. At different time points, supernatants were assayed for infectious virus particles in plaque assays on Vero cells as described in Materials and Methods.